Elecraft T1 ATU Owner's Manual - Manual (Page 6)

6
Basic Operation
The switch on the left (S1) turns on the T1 and activates the PWR and TUNE functions, described below.
The battery is checked on each power-up. If it’s getting low, the red LED will flash twice, and the battery
should be replaced. (Actual battery voltage can be checked as part of the INFO report; see page 7.)
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IMPORTANT – PLEASE READ BEFORE USING THE T1:
• If your transceiver is not protected against high SWR, or if you’re not sure, use no more
than half its rated power during antenna matching. This reduces stress on the final stage.
• Do not use the T1 on bands above 54 MHz. Even though the T1 may appear to achieve a low-
SWR match on these bands, most of the power will be dissipated in the tuner itself.
• When the T1 is turned on, it may generate signals that are audible in your receiver. Once the
operation is complete and the T1 turns itself back off, it will not generate signals of any kind.
Autotuning and SWR Display
• Hold the PWR/TUNE switch until the green LED turns on, then release. The LED will flash.
• To start tuning, transmit while the green LED is flashing (about 3 seconds). If you use SSB voice
or a CW keyer, relay switching will start and stop. Keep transmitting until all LEDs turn off.
• The three LEDs will show approximate SWR as labeled on the SWR bar graph. Intermediate
values are indicated by combinations (Green+Yellow, about 1.5:1; Yellow+Red , about 2.5:1).
If desired, a more accurate SWR reading can be obtained using the INFO feature (page 7).
• Initial tune-ups average 5 seconds. Settings are saved in memories, so retuning is much faster.
• The T1 will turn itself off after tuning, preserving the present settings due to its latching relays.
Faster Retuning with Difficult Loads
• Normally, the T1 retunes from memory only if it finds an SWR of under 1.5:1. You can select a
save/retune SWR threshold of 2:1 to speed retuning of often-used, yet hard-to-match antennas.
• To select a 2:1 threshold for a given initial tune or retune, hold PWR/TUNE until the green LED
turns on and then off, then release. Start transmitting while the LED is flashing, as above.
Autotuning using Remote Control (requires optional adapter)
• Change bands at the transceiver; the T1 will recall the last settings used on the new band.
• To retune, transmit while the green LED is flashing (about 3 sec.). The LEDs will show SWR.
Power Display
• Tap the PWR/TUNE switch (a tap is a press shorter than 1/2 sec.). The yellow LED will flash.
• Begin transmitting within 3 seconds. Approximate power output will be shown on the LEDs:
Green 0.5-1.5 W, Green+Yellow 1.5-3 W, Yellow 3-5 W, Yellow+Red 5-8 W, Red over 8 W.
• If power drops below 0.5 W for 3 seconds, the T1 will turn itself off.